| 摘要 |
A fluid filter having a housing with an inlet and an outlet and a filter cartridge disposed in the housing and comprising a generally tubular filter element confined between endcaps at each end thereof. One end cap is closed and the other end cap has a nipple-like extension with an opening therethrough communicating the interior of the tubular filter with the outlet. The extension is telescopically received by a generally mating socket in the housing and is both axially and circumferentially sealed to the socket, with the circumferential sealing being maintained over a limited range of travel of the filter cartridge relative to the housing. A spring urges the extension toward the axially sealed condition in the socket and a perforated cylinder interposed between the one end cap and the housing precludes the filter cartridge from travelling a distance sufficient to break the circumferential seal between the extension and the socket in the event the flow of fluid through the filter is reversed.
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